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Top Swap Won't Run Right

grandamle91

grandamle91

New member
I just did a top swap on my 98 GP GT ran perfect before. Now to get it to start I have to hold the gas down alittle and it doesn't stay running unless i hold the gas. Only code is P0300 for a random misfire

Heres a video
 




It did that after I switched pcm

I checked the plugs and got it started for alittle bit still had to hold the gas. after it died I tried to start it again and no go
 


Let's see. Your having to keep the TB open and your getting a P0300. Sounds like a vacuum leak to me.
 
Sorry forget to say after I switched the around around the p0300 went away and started and had to hold the gas a little but now i can't get it started
 


Fuel issue? Maybe FP resistor or pump?

Make sure the pump winds up with key "ON". Then check fuel pressure at schrader valve.
 
how would I hook a f\p resistor up on a l36 harness, I dont have a pressure gauge with me but if i push the value in it will shoot over the hood
 
Oh, forgot you did the swap. So starting fliud gets it running and there are no other DTC's. HMMMM.

Still sounds like a vacuum leak. I know it's hard to check for vacuum leaks when it won't idle but maybe someone can help you...one guy with a can of carb cleaner and the other keeping it running at a steady RPM.

Edited:

Did you try unplugging the MAF?
 
I'll see if a friend can help tomorrow before work. Yea i tried the maf no change. oh just noticed something the boost gauge doesnt move when it goes into boost
 
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